What is the position of an image when an object is placed at 20 cm from a concave mirror of focal length 20cm?
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10 cm
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Answered by
63
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Object position (u) = - 20 cm (-ve sign due to position of object opposite to direction of incident ray)
Focal length (f) = -20 cm (focal length of concave mirror is always negative)
Mirror formula
1/f = 1/u + 1/v
-1/20 = -1/20 + 1/v
1/v = -1/20 + 1/20
1/v = 0
v = infinite ( not defined).
HOPE THIS HELP YOU..☺️☺️
Object position (u) = - 20 cm (-ve sign due to position of object opposite to direction of incident ray)
Focal length (f) = -20 cm (focal length of concave mirror is always negative)
Mirror formula
1/f = 1/u + 1/v
-1/20 = -1/20 + 1/v
1/v = -1/20 + 1/20
1/v = 0
v = infinite ( not defined).
HOPE THIS HELP YOU..☺️☺️
Answered by
54
What is the position of an image when an object is placed at 20 cm from a concave mirror of focal length 20cm?
Good question,
Here is your perfect answer!
Here f = - 20cm,
u = - 20cm
(sign convention)
Applying mirror's formula,
=) 1/f = 1/v + 1/u
=) - 1/20 = 1/v - 1/20
=) - 1/20 + 1/20 = 1/v
=) 0/20 = 1/v
=) v = 20/0
=) v = infinity,
Image is formed at infinity.
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